gloetzner



R. A. GLOETZNER.

PRODUCTION 0F ISK RECORDS.

Armcmou msn www. 1919.

1,3 1 1,342. Patent-fed July 29, 1919.

RAYMOND A. GLOETZNER, 0F BERLIN-SCHNEBEM, GERMANY i PRODUCTION OF DISK RECORDS.

Specication of Letters Patent. Ptlntd July 29, 1919.

Application led May 14, 1919. Serial No. 297,172.

To all 'whom t may concern.'

Be it known that I, RAYMOND A. GLoETz- NER, director, citizen of the United States of America, residing at present at No. 9 Aschaffenburgerstrasse, Berlin-Schneberg, Germany, have invented certain new and useful Improvements in the Production of Disk Records, of which the following is a specification.

This invention relates to improvements in the manufacture of sound records in disk form and in particular to the kind known as flexible disks. Such flexible disks have been manufactured in a manner similar to that of the usual composition disk records, known Uenerally as gramophone record viz: The exible tablet has been impressed between matrices placed in dies between the platens of a heavy hydraulic press. On account of the fact that these matrices, being galvanoplastic products, are very rarely of even thickness and in consequence thereof that the matrix surface does not conform to a geometrie plane, it has not been possible to impress the entire surface of a tablet perfectly. Resort was had to other means and in particular to a more direct manner of impression, viz: that of forcing the flexible tablet against the matrix by means of a iuid or gaseous pressure exerted directly against the rear side of the tablet, as disclosed, for example, in British patent to Seymour, No. 24,552 of 1910. This method has not given the desired results as will be pointed out later. After considerable experimenting I have devised a method which permits the production of a record absolutely true to the original in every detail, and which can be best explained by referring to the accompanying drawing, in which- Figure 1 re resents a section through an apparatus em odyng one form of my invention, and

Fi s. 2 and 3, are sectional views of modied orms thereof, embodying however the same principle.

Referring to the drawings, in Fig. 1 g and g', are hollow platens or dies which are kept in close contact with one another during the operation by means of any kind of a press or similar apparatus, or of a simple bolt connection such as I have indicated on the peripheral portions of the platens. c and c',

are annular shoulders or rings constructed integral with the platens g and g and forming the chambers and a. Attached to these rings c and c', in a manner to be described hereafter arediaphragms la and le', and resting on these diaphragms are the matrices f and f. Between the latter is the tablet d which is to be impressed.""Inlets for the pressure medium `are indicated at m and n, and outlets therefor Vat' fm. and n.

In Fig. 2 I have shown an arrangement using only one diaphragm and have omitted one matrix, using the back of the die to impress the reverse side of the tablet, as in a single sided record. In Fig. 3 l substitute for each diaphragm a thin and flexible mntrix.

In this apparatus the diaphragm forms a substantial part of the same and the Working Huid acts in the inclosed chamber Vwithout coming in contact either with the niatriX or the tablet. It is obvious that by these means I obtain the same specific pressure upon each face of the tablet andthat in consequence a record uniform in every detail'results.

It is known that fluids have a deleterious effect upon most thermo-plastic and vchemi'- cal compounds in that they act either as a partial solvent of an ingredient contained in the compound or as a disintegrating agent which destroys the structure and renders the compound valueless for fine and exact impressions. In the present invention I have prevented any direct action of the compressmg Huid on the tablet by retainingr the fiuid in a hermetically sealed recess or compartment in the apparatus and at the same time permit the Huid to exert its full pressure upon the tablet. It may be added that this pressure being exerted on both sides of the tablet the tendency of the latter to Warp is overcome and the further objectionable feature 'is avoided that the iexibile tablets, which are more or less imperfect, have pin holes therein and foreign matter, etc., embedded in them which permits the fluid to enter between the matrix and the tablet and so impair the impression. Another considerable advantage of the construction lies in the fact that tablets can be pressed in the ordinary atmosphere Without recourse being had to packing materials to prevent the medium from entering between and separating the matrix and the tablet. y The diaphragms can be made of any` suitable material and attached to the annular shoulders or rings by a counter ring, when using leather or a similar material. I prefer,

however, to use a metal diaphragm in the shape of a thinly rolled steel or brass sheet of about fifteen .onesthousandths of an :inch in thickness and to Weld o1' solderthis sheet onto the shoulders or rings 'of the platens. It need not be specially pointed out that for `ca1a1'}`;ing out the yprocess `according to my invention matrices which Will flex so as to conform to any irregularity of the tablet should be used. Furthermore ressure medium canJge anyliuid or gas, anY Acan be used lat various temperatures and 1n any combination lto fbest suit the process.r

Other and modifications maybe employed, but the spirit o niylnventlon HSS in' emp @ying 111 Gannett@ Wlth f1 pressing device a chamber h avinga flexible pant in he shape lof a diaphragm upon which a uid or gaseous pressure acts d1- rectly and transmlts `its pressure to or through amatrix to thesound tablet.

In such of the appended claims ras refer specifically to a flexible matrix, the above-mentiolied roperty of the Inatrix of conforming itsey to n irregularities sin `the record blank or tabletlis ,intended to be covered; but .Where ;the matrix is used Without the diaphragms, asl in :the arrangement shown in ,F ig. 3, the matrix `itself vvlll have a diaphrag'rnlike, rrflexing action which, 1n a sense, is supplemental toits ordinary flexion. In any case, moreover, the: pres-spire of the as or other y.is exerted against the ma rix, `Whether directlyr or indirectly, to force 1the matrix against the blank.

Having thus described my invention I claim:

1. The process of molding disk ,sound records, which consists in imposing against the record fblank, While supported againstrnovement, `'a flexible .matrix hevingthesound v1- bration ,to be recordedinarked ,on Working face; and subjecting the lmatriz; to Vthe action of fluid prjessuredirected toward its opposite `face so as to force the matrix against `the record blank `therebynnpress the vibrations in theacil]ac ent face of said record blanksubstantiall described.'

`Y a: 2. The process .of molding disk .sound records, vhich consists in imposin against the recor blank, .while supiporte ,against movement, a ymatrnr ,having t e Asnifuil v,vibrations to be recordedinaijked onrits Working face; and subjecting the matrix `to the action of Ifluid pressure directed Etmvard its opposite face so as to ,forcej L e matrix agai the record ,blank it ereby 11npress be vibrations Yin the a ]acent face of said record blank; said matrix .andreord blank constituting compamon elements, at

least one of which is constructed of flexible material, swbstantially as described.

f'helprows-s ol molding disk sound records, which consists in il'ilposing against the record blank, while .supported against movement, a matrix having the sound. vibra tions to `be recorded marked on its working face; and forcing the matrix bodily against the record blank so as to impress the vibrations in the adjacent 4face thereof `by means of a flexible diaphrafm `which contacts with the matrix and Whic i is distendedlby fluid pressure, substantially as described.

4. A device for molding disk sound records, comprising a pair of opposed dies, at least one of which is provided V.with a fluid pressure chamber having an inlet and an outlet for the fluid, said dies adapted Vto receive between them a record blank; and a matrix on which the vibrations to be lie corded are marked interposed between said pressure chanxber and said blank and in contact with the blank to be forced against said blank by the pressure of the fluid in the chamber, so as to impress the vi rations in the adjacent face of the blank, substantially as described.

5. A device for inoldingdisk sound records, comprising a pair of opposed dies, at one of which is provided with an annular shoulder defining a fluid pressure chamber, said chamber having an inlet and an outlet forthe fluid, and said dies being adapted 'to receive u record blank between them; and a flexible matrix onvvhich the vibrations to be recorded are marked interposed betvvcen .said chamber and said eblank andin contact with the blank to be forced against said 'blank by the pressure of the Huid in the chamber, so as to impress the vibrations in the adjacent face of the` blank, substantially as described. l

6. A device forinolding disk sound records, comprising a pair of opposed .dies, at least one of Vwinch is provided `with an annular shoulder defining an` ol'ien-endedfinid pressure chamber, `said.churn, erllravjgigan inlet and an outlet for the jnikand ,said dies being adapted to receive a reoordllalank betvieen them flexible diaphragm closing the open end of said chamber land ,adapted to be forced toward the blank bythepresf sure of the fluid; and a matrix interposed between said diaphragm and said blanks() as to be impressed against the blank by fthe distention of the diaphragm, substantially as described.

In testimony whereof I afiix my signature. y

.RAYMOND A. sriofnrzinns.k

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